Income Taxes (Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Income tax provision at the statutory rate	$ 42,669	$ 43,768	$ 30,694
State income taxes, net of federal benefit	4,559	4,674	3,807
Permanent difference – non deductible items	1,718	1,608	1,592
Other	1,545	1,507	465
Total	$ 50,491	$ 51,557	$ 36,558